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Sang Shin Park,Yu-Jin Kim,Eun-Chul Kang,Euy-Joon Lee 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
A computational fluid dynamics (CFD) model of a water-based serpentine PVT collector and a GWHX were created using the commercial code in ANSYS FLUENT 2019R3, the model was used to investigate the solar thermal energy and geothermal energy performance. From the CFD simulation results for a water-based serpentine PVT collector, characteristics of heat transfer in the tube was numerically investigated with experimental data. Our CFD simulation results for a water-based serpentine PVT collector were in good agreement with the actual experimental data. In order to simulate performances for heat transfer in GWHX, various types of vertical and horizontal GWHX applied to this CFD simulation. The GWHXs of vertical type and horizontal type were differently obtained with different steady temperature region as length of over 33 m and over 39 m, respectively.
SHIN, SEUNG YONG,NA, JIN OH,LIM, HONG EUY,CHOI, CHEOL UNG,CHOI, JONG IL,KIM, SEONG HWAN,KIM, EUNG JU,PARK, SANG WEON,RHA, SEUNG‐,WOON,PARK, CHANG GYU,SEO, HONG SEOG,OH, DONG JOO,KIM, YOUNGȁ Blackwell Publishing Inc 2011 Journal of cardiovascular electrophysiology Vol.22 No.4
<P> <B>Effect of Ablation on Endothelial Function</B>. <B><I>Background:</I></B> Although atrial fibrillation (AF) is a risk factor for endothelial dysfunction (ED), the effect of catheter ablation (CA) on AF‐associated ED has not been evaluated. The aims of this study are to determine if the degree of ED predicts the outcome of AF ablation and to evaluate whether ED can be improved through restoring sinus rhythm (SR) by successful CA.</P><P> <B> <I>Methods:</I> </B> This study prospectively enrolled 80 subjects who underwent CA for AF (paroxysmal AF = 61, persistent AF = 19). Eighty subjects with no history of AF were enrolled as controls, all of whom were matched by age, gender, body mass index, and atherosclerotic risk factor distribution. Brachial artery flow‐mediated dilatation (FMD) was measured at baseline, and at 1 month and 6 months post CA in AF subjects who remained in SR. Among controls, FMD was measured at baseline and at 6 months. We used high sensitivity C‐reactive protein (hs‐CRP), interleukin‐6, soluble E‐ or P‐selectin, and endothelin‐1 as biomarker indices for inflammation and/or ED.</P><P> <B> <I>Results:</I> </B> Compared with controls, AF subjects had lower FMD at baseline (FMD<SUB>baseline</SUB>, P < 0.001). After successful CA, FMD was significantly improved at 1 month and 6 months, nearly approaching control levels. A multivariate analysis revealed that FMD<SUB>baseline</SUB>, hs‐CRP, and left atrial volume (LAV) were independent predictors for arrhythmia recurrence after CA. Other biomarkers were not related to rhythm outcome.</P><P> <B> <I>Conclusion:</I> </B> AF subjects have significantly impaired FMD, which can be reversed through maintenance of SR by successful CA. FMD<SUB>baseline</SUB>, hs‐CRP, and LAV are important predictors for AF recurrence after CA. <I>(J Cardiovasc Electrophysiol, Vol. 22, pp. 376‐382)</I></P>
Phosphorus Removal in Pilot Plant Using Biofilm Filter Process from Farm Wastewater
Shin, Sung-Euy,Choi, Du-Bok,Lee, Choon-Boem,Cha, Wol-Suk The Korean Society for Biotechnology and Bioengine 2006 Biotechnology and Bioprocess Engineering Vol.11 No.4
Various environmental conditions affecting total phosphorus removal from farm wastewater in a biofilm filter process were investigated using loess balls and Chromobacterium LEE-38 at a pilot plant. When Chromobacterium LEE-38 was used, the removal efficiency of total phosphorous was approximately 10- or 5-fold higher than that of Acinetobacter CHA-2-14 or Acinetobacter CHA-4-5, respectively. When a loess ball of $11{\sim}14mm$ manufactured at a $960^{\circ}C$ calcining temperature was used, the removal efficiency of total phosphorous was 90.0%. When 70% of the volume fraction was used, the maximum efficiency of total phosphorus removal was 93.1%. Notably, when the initial pH was in the range of 6.0 to 8.0, the maximum removal efficiency of total phosphorus was obtained after 30 days. When the operating temperature was in the range of 30 to $55^{\circ}C$, the maximum removal efficiencies of total phosphorus, 95.6 to 94.6%, were obtained. On the other hand, at operating temperatures below $20^{\circ}C$ or above $40^{\circ}C$, the removal efficiency of total phosphorous decreased. Among the various processes, biofilm filter process A gave the highest removal efficiency of 96.4%. Pilot tests of total phosphorus removal using farm wastewater from the biofilm filter process A were carried out for 60 days under optimal conditions. When Acinetobacter sp. Lee-11 was used, the average removal efficiency in the p-adsorption area was only 32.5%, and the removal efficiencies of chemical oxygen demand (COD) and biological oxygen demand (BOD) were 56.7 and 62.5%, respectively. On the other hand, when Chromobacterium LEE-38 was used, the average removal efficiency was 95.1%, and the removal efficiencies of COD and BOD were 91.3 and 93.2%, respectively.
Phosphorus Removal in Pilot Plant Using Biofilm Filter Process from Farm Wastewater
차월석,Sung-Euy Shin,DuBok Choi,Choon-Boem Lee 한국생물공학회 2006 Biotechnology and Bioprocess Engineering Vol.11 No.4
Various environmental conditions affecting total phosphorus removal from farm wastewater in a biofilm filter process were investigated using loess balls and Chromobacterium LEE-38 at a pilot plant. When Chromobacterium LEE-38 was used, the removal efficiency of total phosphorous was approximately 10- or 5-fold higher than that of Acinetobacter CHA-2-14 or Acinetobacter CHA-4-5, respectively. When a loess ball of 11~14 mm manufactured at a 960°C calcining temperature was used, the removal efficiency of total phosphorous was 90.0%. When 70% of the volume fraction was used, the maximum efficiency of total phosphorus removal was 93.1%. Notably, when the initial pH was in the range of 6.0 to 8.0, the maximum removal efficiency of total phosphorus was obtained after 30 days. When the operating temperature was in the range of 30 to 55°C, the maximum removal efficiencies of total phosphorus, 95.6 to 94.6%, were obtained. On the other hand, at operating temperatures below 20°C or above 40°C, the removal efficiency of total phosphorous decreased. Among the various processes, biofilm filter process A gave the highest removal efficiency of 96.4%. Pilot tests of total phosphorus removal using farm wastewater from the biofilm filter process A were carried out for 60 days under optimal conditions. When Acinetobacter sp. Lee-11 was used, the average removal efficiency in the p-adsorption area was only 32.5%, and the removal efficiencies of chemical oxygen demand (COD) and biological oxygen demand (BOD) were 56.7 and 62.5%, respectively. On the other hand, when Chromobacterium LEE-38 was used, the average removal efficiency was 95.1%, and the removal efficiencies of COD and BOD were 91.3 and 93.2%, respectively.
( Hong Euy Lim ),( Hwan Seok Yong ),( Sung Hee Shin ),( Jeong Cheon Ahn ),( Hong Seog Seo ),( Dong Joo Oh ),( Young Moo Ro ),( Chang Gyu Park ) 대한내과학회 2004 The Korean Journal of Internal Medicine Vol.19 No.4
Backgroud : Recent studies have demonstrated that the size and shape of the hyperenhanced areas on contrast-enhanced magnetic resonance imaging (ceMRI) were nearly identical to areas of irreversible injury, as defined by histochemical staining. We compare
Young Shin Kim(김영신),Yoon Sang Kim(김윤상),Euy Sik Jeon(전의식) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.4
An electric vehicle operates at high currents and requires real-time monitoring of the entire system for ensuring efficiency and safety of the vehicle. Current sensors are applied to drive the motors, inverters, and battery control systems, and are the key components to ensure constant monitoring of the magnitude and waveforms of the operating current. In this study, a heat treatment process condition to influence the performance of Permalloy current sensors was developed; the correlation between the output capacity, low-temperature characteristics, and high-temperature characteristics of the current sensor was studied; and the process was optimized to meet the required output accuracy and temperature characteristics.
Durability Performance of Concrete using Rice Husk Ash
Jeong, Euy-Chang,Shin, Sang-Yeop,Kim, Young-Soo The Korean Institute of Building Construction 2013 한국건축시공학회지 Vol.13 No.2
The purpose of this study was to investigate the durability performance of concrete that includes rice husk ash. Chloride diffusion coefficient obtained through a rapid chloride penetration test and depth of $CO_2$ penetration obtained through a rapid carbonation test were used to evaluate latent durability. Durability characteristics for rice husk ash replacement and age were determined. Through the experiment, it was found that when the replacement ratio of rice husk ash was increased from 0% to 10%, the compressive strength of concrete containing rice husk ash was similar to that of concrete containing silica fume. This shows that the durability performance of concrete containing rice husk is excellent compared to other concretes containing admixtures.